概述:

The MAX705–MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.

The MAX705/MAX706/MAX813L provide four functions:

1. A reset output during power-up, power-down, and brownout conditions.
2. An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.
3. A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V.
4. An active-low manual-reset input.

The MAX707/MAX708 are the same as the MAX705/MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of active-low RESET.

Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX® packages.

关键特性:

• Available in Tiny µMAX Package
• Guaranteed RESET Valid at V_CC = 1V
• Precision Supply-Voltage Monitor
  • 4.65V in MAX705/MAX707/MAX813L
  • 4.40V in MAX706/MAX708
• 200ms Reset Pulse Width
• Debounced TTL/CMOS-Compatible Manual-Reset Input
• Independent Watchdog Timer—1.6s Timeout (MAX705/MAX706)
• Active-High Reset Output (MAX707/MAX708/MAX813L)
• Voltage Monitor for Power-Fail or Low-Battery Warning

类型 ：	简单复位/加电复位
监视电压数目 ：	1
输出 ：	推挽式，图腾柱
复位 ：	低有效
复位超时 ：	最小为 140 ms
电压 - 阀值 ：	4.4V
工作温度 ：	0°C ~ 70°C
安装类型 ：	表面贴装
封装/外壳 ：	8-SOIC（0.154", 3.90mm 宽）
描述  ：	IC MPU SUPERVISORY CIRCUIT 8SOIC

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